Skyrim always becomes unstable after thousands of saves.
Therefore, I have no choice but to rebuild my Skyrim install. That also means I will have to play through the game to reach where I was.
I was going to do this before testing the new version of Rigmor of Cyrodiil. Therefore, this rebuild is a few weeks earlier than planned. So, be patient. I should be making new journal entries within a week, I hope!